Welded Pipe Manufacturing Patents: Who Leads, Trends 2026
- 64.1% of all 518 records in scope sit with just five assignees, and 77.4% with ten — this field is held tightly at the top with a long tail below it.
- Filing peaked in 2017 at 13 records and the 2021-to-2024 span shows a 50% decline (10 to 5); note that 2025 onward is still filling in under an 18-month publication lag.
- E21B (wells) carries 44.4% of records well ahead of B23K welding itself at 18.3% — a sign that much of the claimed activity here is pipe-in-well application, not the weld process proper.
Filing growth compares 2021 (10 records) with 2024 (5) — a three-year span. 2024 is the most recent year we treat as complete: publication lags filing by roughly 18 months, so 2025 onwards are still filling in and any growth rate that ends there would understate the field. Top-5 share is the combined record count of the five largest assignees divided by all 518 records in scope (CR5), not by the ranked leaders only.
What's being claimed, and by whom
Welded pipe manufacturing patenting in this dataset spans 518 published records filed between 2015 and 2026, drawn from a search anchored on resistance-welded pipe, spiral submerged-arc welding and the quality-control disciplines around them: weld seam quality, forming roll design, hydrostatic testing, seam heat treatment, ovality control and nondestructive inspection. The claim activity is not evenly split between the weld process and its downstream use. E21B (earth and rock drilling) is the single largest IPC subclass at 44.4% of records, ahead of G01N (material analysis and testing) at 19.9% and B23K (welding, soldering and brazing) at 18.3% — the corpus leans toward well-pipe applications and their inspection, with the weld metallurgy itself a secondary though still substantial share.
Filing offices skew heavily toward the United States, which receives more than double the filings of Japan, the next largest office, with China, Europe, the UK and the WIPO/PCT route each taking smaller single-digit shares of the total. That distribution points to a field where US prosecution and litigation exposure matters most, though Japanese assignees remain active filers in their home office.
Filing trend and technology mix
Two views of the same 518 records: how filing volume has moved year over year, and how the claim space splits across IPC subclasses.
Filing trend, 2017–2026
Filings peaked at 13 records in 2017. The 2021-to-2024 window — the most recent span with complete publication — shows a drop from 10 to 5 records, a 50% decline; 2025 and 2026 figures will rise as later-filed applications publish.
Technology composition by IPC subclass
Shares are computed against all 518 records and add to more than 100% because a single record can carry several IPC classes. E21B and G01N together suggest well-service and inspection use cases outweigh pure weld-process claims in raw volume.
Shares are the percentage of the 518 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Welded Pipe Manufacturing with Eureka
This page is one run against one query. Ask Eureka your own question about welded pipe manufacturing and every answer comes back with the patent numbers behind it.
Try EurekaA representative claim in this space
CA2881372C — Electric resistance welded pipe (Nippon Steel Corporation)
An electric resistance welded steel pipe engineered for sufficient strength and low-temperature toughness with a low yield ratio, suited to line-pipe service at depth offshore. The base-material composition is specified by mass percentage of carbon, manganese and niobium within stated ranges and a defined carbon-equivalent value, with the metal structure holding a specified martensite area fraction against a ferrite balance.Filed by Nippon Steel Corporation; granted 2017-11-21.
View full record →| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20080128134A1 | Producing drive fluid in situ in tar sands formations | 261 |
| 2 | US20090189617A1 | Continuous subsurface heater temperature measurement | 258 |
| 3 | US20080174115A1 | Power systems utilizing the heat of produced formation fluid | 258 |
| 4 | US20130279561A1 | System and method for time reversal data communications on pipes using guided elastic waves | 253 |
| 5 | US20090071652A1 | In SITU heat treatment from multiple layers of a tar sands formation | 245 |
| 6 | US7635023B2 | Time sequenced heating of multiple layers in a hydrocarbon containing formation | 231 |
| 7 | US7549470B2 | Solution mining and heating by oxidation for treating hydrocarbon containing formations | 230 |
| 8 | US7562707B2 | Heating hydrocarbon containing formations in a line drive staged process | 224 |
| 9 | US7533719B2 | Wellhead with non-ferromagnetic materials | 219 |
| 10 | US20090014180A1 | Moving hydrocarbons through portions of tar sands formations with a fluid | 213 |
Citation counts reward older filings simply for having had more time to accumulate them — read this as a signal of influence within the searched corpus, not of current commercial relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Three readings of the dataset that matter more for freedom-to-operate than the raw counts alone.
The field is held tightly at the top
With 64.1% of all 518 records sitting under five assignees and 77.4% under ten, most of the claimed ground in welded pipe manufacturing is already occupied by a small group. A new entrant should expect to design around, or license from, one of these holders rather than find open ground among the leaders' core claims.
Volume has cooled from its 2017 peak
Filing peaked at 13 records in 2017 and the last fully-published three-year window shows a 50% drop, from 10 records in 2021 to 5 in 2024. That is a genuine slowdown in the complete data, not an artefact — but 2025 and 2026 are still under-reported because of the roughly 18-month publication lag and should not be read as confirming the decline continues.
Application claims outweigh process claims
E21B (wells) carries nearly two and a half times the record share of B23K (welding itself). Much of the patenting activity documented here protects how welded pipe is used downhole rather than how the weld is made — a distinction that matters for anyone trying to map freedom-to-operate onto the weld process specifically.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to welded pipe manufacturing, with the prior art for and against each one.
Who holds the claims
The ranked leaders account for a large share of the total record count, with steel majors and oilfield-service specialists forming the dense core and a long tail of single- or few-filing entrants behind them.
Integrated steelmakers anchor the core
The leading assignee alone accounts for 196 of the 518 records in scope, consistent with an integrated steelmaker that patents across pipe metallurgy, forming and inspection rather than a single narrow process step.
Co-invention clusters around specific inventor teams
Ten co-assignee pairs appear in the data, with the strongest links tied to a single inventor group filing repeatedly with named co-inventors — a pattern typical of an oilfield-services R&D team building a defensive thicket around thermal and in-situ recovery methods rather than the weld itself.
A wide base of smaller filers
Beyond the ten-strong leading group, the ranking runs to 100 companies, most holding only a handful of records each. This long tail is where narrower, more specific claims — on inspection methods or seam treatment variants — are more likely to still be open.
| Assignee | Recent year | YoY |
|---|---|---|
| Shell Oil Company | 0 | — |
| Shell Internationale Research Maatschappij B.V. | 0 | — |
| Nippon Steel Corporation | 0 | — |
| VINEGAR HAROLD J | 0 | — |
| KARANIKAS JOHN MICHAEL | 0 | — |
| CRC-Evans Pipeline International, Inc. | 0 | — |
| NIPPON STEEL & SUMITOMO METAL CORP | 0 | — |
| SANDBERG CHESTER LEDLIE | 0 | — |
Where to take this next
The dataset points to a field with occupied core claims and a thinner, more specific layer of process detail still open for filing.
Map a specific claim against the leader's portfolio
Run the leading assignee's 196 records against a draft claim before committing engineering time, since that single holder covers more than a third of the field.
Open Eureka to search assignee portfolios →Check the under-claimed branches directly
Ovality control loops, seam NDI signal processing and forming-roll geometry show thinner density than the core weld and well-application classes — worth a targeted search before assuming freedom to operate.
Run a white-space search in Eureka →Common questions on welded pipe manufacturing patents
The dataset's assignee ranking is led by a single company holding 196 of the 518 records in scope, with the top five assignees combined accounting for 64.1% of all records and the top ten reaching 77.4%. This is a concentrated field: integrated steelmakers and oilfield-service specialists dominate the core claims, while a long tail of around 100 ranked companies holds smaller numbers of filings each. Anyone entering the space should expect to negotiate around, or clearly design outside, the leading holders' claims rather than find open ground at the centre of the field.
Filing peaked at 13 records in 2017 within this dataset, and the most recent complete three-year window shows a decline from 10 records in 2021 to 5 in 2024, a 50% drop. Figures for 2025 and 2026 appear lower still, but that reflects the roughly 18-month lag between filing and publication rather than a confirmed continuation of the slowdown. A fair read is that filing has cooled from its 2017 peak, with the true 2025–2026 level not yet visible in published data.
By IPC subclass, E21B (earth and rock drilling, i.e. well applications) leads at 44.4% of the 518 records, followed by G01N (material analysis and testing) at 19.9% and B23K (welding, soldering and brazing) at 18.3%. Because a single record can carry multiple IPC classes, these shares add to more than 100% and should not be read as mutually exclusive segments. The pattern indicates that a large share of patenting activity protects how welded pipe is applied and tested downhole, not only how the weld itself is formed.
CA2881372C claims an electric resistance welded steel pipe defined by a specific base-material composition — carbon, manganese and niobium within stated mass-percentage ranges plus a defined carbon-equivalent value — combined with a metal structure holding a specified martensite area fraction against a ferrite balance. That combination is engineered to deliver sufficient strength and low-temperature toughness with a low yield ratio, making the pipe suitable for offshore line-pipe service at depth. A designer working with electric resistance welded line pipe for similar service conditions needs to check composition and microstructure ranges against this claim rather than assume the weld process alone clears it.
Relative to the dense core of well-application and weld-metallurgy claims, several process-control sub-areas show thinner documented activity: inline ovality correction, automated seam nondestructive-inspection signal processing, post-weld seam heat-treatment profiling, forming-roll geometry optimisation and spiral submerged-arc-welding seam alignment sensing. These sit adjacent to the heavily claimed core rather than replacing it, so a workable first claim typically narrows to a specific sensing, control-loop or profiling method rather than the pipe or weld composition itself. Confirming actual openness still requires a targeted freedom-to-operate search against the current leaders' full portfolios.
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Disclaimer. This page is generated from Patsnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company’s registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.